benghazi is where the consulate was taken out two days ago. further to the east in cairo are the images we've been putting on our screen, the protests that have gone back and forth, cat and mouse in the streets today. common boards between tripoli. captain chuck nash is here. these navy destroyers are going to be positioned off the tripoli is that your understanding or do they move back and forth between the two towns of tripoli and benghazi? >> they will be patrolling back and forth between the two towns. they have collection systems on them, and they are going to be monitoring electronic transmissions, radios, walkie-talkies, cell phones, that kind of thing, they will be collecting intelligence. bill: can they help us find those who are responsible? >> i think they will be part of the intelligence collection effort for sure. the other thing they'll probably be doing is keeping an eye on some iranian ships that have a habit showing up in places recently like benghazi, egypt and yemen. and the ships are, as far as we can tell, it's a shell gam